TY - JOUR T1 - Multiple imputation for patient reported outcome measures in randomised controlled trials : advantages and disadvantages of imputing at the item, subscale or composite score level JO - BMC Medical Research Methodology PY - 2018/12/01 AU - Rombach I AU - Gray AM AU - Jenkinson C AU - Murray DW AU - Rivero-Arias O ED - DO - DOI: 10.1186/s12874-018-0542-6 PB - BioMed Central VL - 18 IS - 1 Y2 - 2024/12/22 ER -